Search Results

The Interior noise is now one of the signatures of passenger vehicles. It contributes significantly to a customer's perception of quality. The vehicle acoustic package can be an important piece to the acoustic signature, and can be used not only to reduce sound level inside the vehicle but also to shape the sound such that it meets the expectation of customer and increasing competition between the Vehicle Manufacturers. The conflicting objective of maintaining high Noise, Vibration and Harshness (NVH) characteristics at the same time reducing the weight of the vehicle is a major priority within the Automotive Industry. Moreover to meet ever-growing demand to minimize emission and to achieve greater efficiency from automobiles, there has been a constant effort to reduce the weight of the vehicle body structure along with improving NVH of vehicle.

Vehicle hood experiences impact loading once it is dropped freely from a specific height. This phenomenon is known as Hood Slam (HS). HS induces damage to the components of the hood and front end module. This damage accumulates over the vehicle lifetime and may lead to failure. In a traditional design process, the durability performance of the hood and front end module is evaluated by conducting an impact test. It is, however, very costly and time-consuming to achieve a statistical-based confidence. This paper presents the CAE methodology that intends to replace the physical test and predict the durability performance of the hood and front end module early in the design cycle. The precise capturing of the time dependent contact conditions between the different components of the closing mechanism is essential in simulating the load transfer between the hood and the body.

Air conditioning these days has become an indispensable part of human comfort due to rising global temperatures. In order to achieve thermal comfort in confined environments like residences, car passenger cabins, offices, etc., air conditioners are used. As the air conditioning units employ dynamic processes to maintain thermal comfort it creates many unwanted noises which lower the acoustic comfort. One of these unwanted noises is the refrigerant flow induced noise inside passenger cabin of an automobile when the air conditioning is switched on in a thermally soaked vehicle. This paper elaborates about the study conducted on a HVAC system mounted on a calorimetric bench in a semi-anechoic chamber to understand the noise signatures and acoustic characteristics of refrigerant induced noise. This research investigates potential causes and solutions for noise generated by refrigerant flow.

Automobile manufacturers in the developing nations tend to make more and more fuel efficient cars compared to the luxurious type, given to the popularity. Fuel efficiency has a direct relation with the weight of the vehicle. In order to increase the fuel efficiency, body weight has to be decreased. The weight of all door panels comprises about 15% of body weight of the vehicle. Hence, by reducing the weight of the door panels, fuel efficiency of a vehicle can be increased. But, reduction of the weight of the door panels may lead to decrease in the strength of the panels. Therefore, we need to find a method to increase the fuel efficiency by decreasing the weight and maintaining the strength of the door panels. The aim of our study is to increase the performance while decreasing the weight of the door panel assembly. We have used CAE (Computer aided Engineering) as a tool to study and evaluate the performance of doors, with varying thickness and different shapes like beads.

With Ever Increasing Vehicle speed and Vehicle concentration on roads the number of accidents is also increasing. Safety and Strength of Vehicle has become a prime focus in Automobile Industry. The endeavor is to make a safe vehicle which would ensure occupants safety during collision. In Automotives, door system strength plays a vital role in defining the vehicle response during accidents. These accidents through, side door intrusion test and dynamic side impact test are simulated in the vehicle development cycle. Strength of the door required to meet these test criteria is dependent on the door beam, reinforcements, beam layout, vehicle construction and materials selected. There is not a fix method for door beam selection and design. Hence, it becomes all the more difficult to design and layout door beam and other reinforcements. In this paper we will discuss, challenges faced in a layout of door beam for a new vehicle program.

A muffler or silencer is an integral part of the exhaust system and is a device used to prevent sound from reaching the openings of the exhaust duct and radiating as far field noise. Different acoustical design and analysis techniques are used to predict the acoustical performance of exhaust systems. Flow noise from exhaust tail pipe is one of the major noise sources in a vehicle. Flow noise is generated mainly during fast acceleration operating condition due to complex flow behavior. In this paper, we have studied the detailed flow field and tried to establish an analyses procedure for flow noise prediction. The flow analysis is carried out in commercial CFD solver Star CCM+. The transient engine boundary conditions are obtained from the experimental testing. The flow noise generated from the muffler was calculated by acoustic analogy of Lighthill using the above boundary conditions.